Elastic scattering of 4–20 MeV alpha particles by Be9

doi:10.1016/0029-5582(65)90272-5

Nuclear Physics

Volume 65, Issue 2, March 1965, Pages 318-328

https://doi.org/10.1016/0029-5582(65)90272-5 Get rights and content

Abstract

The scattering of alpha particles by Be⁹ has been studied in the bombarding energy range 4–20 MeV. Eight excitation functions and sixteen angular distributions were measured. Angular distributions were analysed with an optical model which included a term coupling the target spin I to the orbital angular momentum l. The optical model parameters varied smoothly with energy over the entire range, and the value of the spin-orbit parameter V_SO variedfrom 1.6 to 2.7 MeV. Real well depths of about 55 MeV were used. Optical model fits without the $I · 1$ term were poor especially at back angles. A smooth cut-off model analysis was also attempted with little success.

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P.E. Hodgson

The optical model of elastic scattering

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This paper reports on elastic scattering excitation functions for the reaction ⁹Li+⁴He measured at backward angles in the centre of mass energy range 5 MeV ≤ E ${}_{c.m.}\leq 9.5$ MeV, with the aim of investigating the possible existence of molecular resonances which have been predicted to exist in the case of neutron-rich B-isotopes. Due to the short lifetime of ⁹Li, the experiment necessitated the use of inverse kinematics on a gaseous ⁴He target. The Thick Target Inverse Kinematics technique was used which allowed for the measurement of the full excitation function in a single ⁹Li run. Broad resonances were observed in the excitation region for ¹³B 15 MeV ≤ E $_{x} \leq$ 20 MeV. To understand the nature of such broad structures, various theoretical attempts are reported concerning possible reaction mechanisms for this neutron rich reaction. The most promising approach to interpret the data is within the orbiting reaction scenario.
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For these reasons, in the present paper we report on new α+9Be EBS differential cross sections measured in the 3.48 < Eα < 9.94 MeV bombarding energy domain with a 60 keV step and at various backward angles (160°, 150°, 135°, 110°). Experimental results have been compared with data reported in literature (IBANDL database [9] and Refs. [10–14]), and an overall agreement is observed. A brief discussion about the 13C compound nucleus spectroscopy is also given by comparing the position of maxima and minima observed in the excitation functions with both level systematics [16] and/or more recent results [17,15,19,20].
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Increasing use of ⁴He analysis beams with energies between 2 and 10 MeV for depth profiling and backscattering analysis of thin films and near-surface materials requires accurate measured values of non-Rutherford cross sections for scattering of ⁴He by the lighter elements. Cross sections for scattering of ⁴He through large angles deviate from Rutherford at ⁴He laboratory energy ∼ 2.2 MeV for target nuclei ¹²C and ¹⁶O; deviations for target atomic numbers Z = 20 and 40 occur at ⁴He energies of about 5 and 10 MeV, respectively. We review the experimental cross section data currently available for large angle scattering of ⁴He from the light elements (4 ≤ Z ≤ 20) for incident ⁴He laboratory energies 1.5–10 MeV. For each target element, we indicate energy regions with smooth cross section variation suitable for use for simple backscattering analysis as well as strong narrow resonances that may be used for depth profiling light elements in heavy-element matrices.
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^††: Work supported in part by the Air Force Office of Scientific Research.

^†: Present Address: AERE Harwell, U.K.

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Nuclear Physics

Abstract

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Phys. Lett.

Nuclear Physics

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The optical model of elastic scattering

Cited by (47)

Hints of quasi-molecular states in <sup>13</sup>B via the study of <sup>9</sup>Li-<sup>4</sup>He elastic scattering

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Investigation of beryllium diffusion in the supercooled liquid and glassy states of the amorphous alloy Zr<inf>41.2</inf>Ti<inf>13.8</inf>Cu<inf>12.5</inf>Ni<inf>10</inf>Be <inf>22.5</inf> by high energy helium elastic backscattering

Non-Rutherford <sup>4</sup>He cross sections for ion beam analysis

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